import getWeb3 from '@drizzle-utils/get-web3';
import getContractInstance from '@drizzle-utils/get-contract-instance';
import { call, put, takeLatest, select } from 'redux-saga/effects'

import Forum from '../../contracts/Forum';

const accounts = (state) => state.accounts;
let initFlag, web3, contract;

function* init() {
    if(!initFlag) {
        web3 = yield call(getWeb3);
        contract = yield call(getContractInstance,{
            web3,
            artifact: Forum
        });
        initFlag=true;
        yield put({type: 'DRIZZLE_UTILS_SAGA_INITIALIZED', ...[]});
    }
    else
        console.warn("Attempted to reinitialize drizzleUtilsSaga!");
}

// If the method below proves to be problematic/ineffective (i.e. getting current account
// from state), consider getting it from @drizzle-utils/get-accounts instead
// with (yield call(getAccounts, {web3}))[0];
function* getCurrentAccount(){
    return (yield select(accounts))[0];
}

function* drizzleUtilsSaga() {
    yield takeLatest("DRIZZLE_INITIALIZED", init);
}

export { web3, contract, getCurrentAccount }

export default drizzleUtilsSaga;